两个带有 2 个 uibutton 的选项卡

Question

我有以下按钮：

// First Tab selected
UIButton *firstTabButton = [UIButton buttonWithType:UIButtonTypeCustom]; 
firstTabButton.frame = CGRectMake(75, 42, 153, 42);
[firstTabButton setTitle:@"FirstTab selected" forState:UIControlStateNormal];
[firstTabButton addTarget:self action:@selector(tabToggler:) forControlEvents:UIControlEventTouchUpInside];
[firstTabButton setBackgroundImage:[UIImage imageNamed:@"FirstTabActive.png"] forState:UIControlStateNormal];
firstTabButton.adjustsImageWhenHighlighted = NO;
[self.view addSubview:firstTabButton];

// First Tab

UIButton *firstTabButton = [UIButton buttonWithType:UIButtonTypeCustom]; 
firstTabButton.frame = CGRectMake(75, 42, 153, 42);
[firstTabButton setTitle:@"FirstTab selected" forState:UIControlStateNormal];
[firstTabButton addTarget:self action:@selector(tabToggler:) forControlEvents:UIControlEventTouchUpInside];
[firstTabButton setBackgroundImage:[UIImage imageNamed:@"FirstTab.png"] forState:UIControlStateNormal];
firstTabButton.adjustsImageWhenHighlighted = NO;
[self.view addSubview:firstTabButton];

//Second Tab Active
UIButton *secondTabButton = [UIButton buttonWithType:UIButtonTypeCustom]; 
secondTabButton.frame = CGRectMake(75, 42, 153, 42);
[secondTabButton setTitle:@"Second Tab Active" forState:UIControlStateNormal];
[secondTabButton addTarget:self action:@selector(tabToggler:) forControlEvents:UIControlEventTouchUpInside];
[secondTabButton setBackgroundImage:[UIImage imageNamed:@"SecondTabActive.png"] forState:UIControlStateNormal];
secondTabButton.adjustsImageWhenHighlighted = NO;
[self.view addSubview:secondTabButton];
appDelegate = [[UIApplication sharedApplication] delegate];

//Second Tab
UIButton *secondTabButton = [UIButton buttonWithType:UIButtonTypeCustom]; 
secondTabButton.frame = CGRectMake(75, 42, 153, 42);
[secondTabButton setTitle:@"Second Tab" forState:UIControlStateNormal];
[secondTabButton addTarget:self action:@selector(tabToggler:) forControlEvents:UIControlEventTouchUpInside];
[secondTabButton setBackgroundImage:[UIImage imageNamed:@"SecondTabActive.png"] forState:UIControlStateNormal];
secondTabButton.adjustsImageWhenHighlighted = NO;
[self.view addSubview:secondTabButton];
appDelegate = [[UIApplication sharedApplication] delegate];

第一次我想显示第一个选项卡“活动”和第二个选项卡。

tabToggler 方法会是什么样子？我该如何继续？

Answer 1

您应该只使用 UIButton 的 2 个实例，并将它们声明为 .h 文件中的属性/ivars。然后只需在您的toggleActiveTab 方法中切换使按钮看起来处于活动/非活动状态的属性即可。

像这样：

在 .h 中

@interface...
{
  UIButton *_firstButton;
  UIButton *_secondButton;
}

在 .m 中（loadView 或 viewDidLoad，取决于您是否使用 NIB）：

_firstButton = <code to set up the first button>;
_secondButton = <code to set up the second button>;

最后，您的toggleActiveTab 方法可能如下所示：

- (void)toggleActiveTab
{
  BOOL activateSecond = _firstButton.enabled;
  _firstButton.enabled = !activateSecond;
  _secondButton.enabled = activateSecond;

  // whatever other setup
}

不要忘记释放 dealloc 方法中的 2 个按钮。

另外：您是否考虑过使用 UITabBarController 来代替？